Oneday,aprofessorwalkedintotheclassroomandaskedhisstude...
问题详情：Oneday,aprofessorwalkedintotheclassroomandaskedhisstudentstogetreadyforasurprisetest.Theywaited 41 attheirdesksforthetesttobegin.Theprofessor 42 thequestionpapers,withthetextfacingdown...